Systems , Networking and General Technology

Main menu

Post navigation

After a few years thinking of creating a blog about my personal notes collected throughout my professional life. Well, now it is the time.

When you are trying to implement new system or networking services, the normal rule is the emergence the troubles. When you have just successfully, all is well , just then you remember all steps performed, but when it takes a fews weeks or months and you have to implemnet the same service then you don’t remember. Sometimes you have luck finding old notes but not always.

This blog is created with the intention of posting some of my old personal notes found and the new fron now on. The post are related with my job as Systems Engineering. You will find post about Linux Servers: DHCP/DNS, Database, Monitoring, High Availability, Virtualization, Storage,… And post about Networking: Security, Routing, Switching, Cisco, VPN, VLANs, ….

GNS3 is a graphical network simulator that allows simulation of complex networks. GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to study for certifications such as Cisco CCNA, CCNP, CCIP and CCIE.

NagVis is a visualization addon for the well known network managment system Nagios. NagVis can be used to visualize Nagios Data, e.g. to display IT processes like a mail system or a network infrastructure.

| Checking Backends. (Available: mklivestatus,ndo2db,ido2db,merlinmy) | | Do you want to use backend mklivestatus? [y]: n | Do you want to use backend ndo2db? [n]: n | Do you want to use backend ido2db? [n]: n | Do you want to use backend merlinmy? [n]: n | NO (valid) backend(s) specified MISSING |

Nagios is an open source computer system monitor, network monitoring and infrastructure monitoring software application. Nagios offers monitoring and alerting for servers, switches, applications, and services. It watches hosts and services. It alerts users when things go wrong and alerts them again when those wrong things get better/resolved.

# This file controls the state of SELinux on the system.# SELINUX= can take one of these three values:# enforcing – SELinux security policy is enforced.# permissive – SELinux prints warnings instead of enforcing.# disabled – No SELinux policy is loaded.SELINUX=disabled# SELINUXTYPE= can take one of these two values:# targeted – Targeted processes are protected,# mls – Multi Level Security protection.SELINUXTYPE=targeted

# This file controls the state of SELinux on the system.# SELINUX= can take one of these three values:# enforcing – SELinux security policy is enforced.# permissive – SELinux prints warnings instead of enforcing.# disabled – No SELinux policy is loaded.SELINUX=disabled# SELINUXTYPE= can take one of these two values:# targeted – Targeted processes are protected,# mls – Multi Level Security protection.SELINUXTYPE=targeted